Amino acids, which are the building blocks of peptides and proteins, are indispensable chemicals needed by the body for optimal metabolism and proper body functioning. Classiied as essential, nonessential and conditionally essential, amino acids play vital roles in the body such as in protein synthesis and as precursors in the production of secondary metabolism molecules. Amino acid oxygenases also play vital metabolic roles such as in prevention of diseases; as a result, amino acids and their oxygenases isolated from various organisms are potent candidates in treatment of diseases which include cancers, inlammations, as well as antibacterial agents.